Saw-filing apparatus



(No Model.) "2 SheetsSheet 1'.

C. G. MITCHELL SAW FILING APPARATUS.

No. 566,003. Patented Aug. 18, 1896.

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(No Model.) 2 Sheets-Sheet 2.

G. G. MITCHELL.

SAW FILING APPARATUS.

No.- 566,003. Patented Aug. 18, 1896.

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UNITED STATES PATENT OFFICE.

CHARLES G. MITCHELL, OF PITTSBURG, PENNSYLVANIA.

SAW-FILING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 566,003, dated August18, 1896.

- Application filed December 4, 1895. Serial No. 571,004 (No model.)

To all whom it may concern: 7

' Be it known that I, CHARLES G. MITCHELL, a citizen of the UnitedStates, residing at Pittsburg, in the county of Allegheny and State ofPennsylvania, have invented certain new and useful Improvements inSaw-Filing Apparatus; and I do hereby declare the following to be afull, clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

- My invention consists in an improved construction of apparatus forfiling the teeth of saws, the object of the invention being to secureincreased efficiency and greater accuracy in operation, which aresecured by means of the novel features of construction, combination, andarrangement hereinafterdescribed, and pointed out in the claims. 1

In the drawings, Figure 1 represents in perspective view my improvedsaw-filing device, the position of the saw to be filed being indicatedby dotted lines. Fig. 2 is a partial vertical section taken on the linea; 00 of Fig. 1 and showing in elevation the file-carrier and its guide.Figs. 3, 4L, 5, and 6 are detail views showing more clearly theconstruction of the several parts.

The device comprises, essentially, a frame for clamping the saw, an armtraveling thereon and supporting the filing mechanism, avertically-movable arm carrying the adjustable file-guide, and anadjustable file-carrier sliding in the file-guide.

A is the saw-clamping frame, which comprisesthe following parts, viz:bars act, which at their upper ends are rigidly secured to a bar a onwhich slides snugly but easily the supporting-arm B; fingers a pivotedto the arms a and provided with clamping-screws 7c, and bars a a whichare rigidly affixed to the bars a and a respectively, and firmly embracethe saw-blade near its toothed edge when the frame is clamped thereon.The

.arms a extend below the cross-bar a and are provided at their lower endwith bolts 2' and thumb-nuts j, by means of which the frame A is securedto a suitable support, such as a board g, which can be fixed in avise orin any other suitable manner in 'a convenient position.

The supporting-arm B is provided with slots of which the bolt is clampedat any point in the slot Z). The slot 6 has seats 6 formed at intervals,and through this slot is passed a short stud or pino, headed at eachend, and which passes also through the sliding gage H and through a studn, which fits the seats 6 The vertically-movable arm 0, which carriesthe file-guide D, is fitted upon the supporting-arm B and slides easilythereon, its downward movement being arrested by the head of the bolt M,as seen in Fig. 2. 7 At its free end the arm 0 is formed with apartlycircular portion 0, graduated, as shown,to 7o enable the angle ofthe file-carrier to the frame A, and consequently to the saw, to beexactly regulated. The file-guide D has the depending slotted ears orlugs d d, and a thumb-screw Z, which passes through the arm C and isthreaded into the guide D, serves to clamp the guide D to the arm in anydesired position. A central mark on the guide D serves to indicate theangle at which the guide is set, as seen in Figs. 1 and 2, or viceversa.

The file-carrier consists of the guide-bar E, which slides smoothly inthe slotted lugs of the guide D and which carries at one end the clip Gto receive the point or tip of the file and at the other the handle F,in which is clamped the tang of the file. The handle F is split at itsinner end, and the jaws f f, which are hollowed to receive the file, areexternally recessed at f so as to receive the curved jaws e of the clampe, which is rig- 9o idly secured to the bar E and provided with abinding-screw p, by which the clamp e is clamped upon the handle F andthe jaws f f simultaneously clamped upon the file 20. One

or both of the jaws e is graduated, and a 5 mark on one of the jaws f,or vice versa, indicates the angle of the file-face to the saw edge andregulates and governs the pitch of the saw-teeth.

The gage H is secured to the back of arm B by the pin 0 or by beingseated in a dovetail groove in the arm B and has its toe h projectingover the saw, as seen in Fig. 2. At the top of arm B is pivoted a latch1", which engages the pin 5 on arm 0 when the latter is raised and holdsit suspended when desired.

In filing a saw the frame A is secured to the board g, which is fixed inplace, the arm Bis slid to the end of the frame, and the gage H islowered to the proper depth and secured in place by setting the stud winone of the slots 5 The saw, having been jointed or had the points of itsteeth filed to aline, is placed between the bars a a with teeth touchinggage H, and that end of frame is clamped. Arm B is then slid to theother end of frame, the saw raised until its teeth touch gage H, andthat end clamped. The clamp is now precisely parallel to the edge of thesaw, and the gage II is raised out of contact with the saw and held soby inserting the stud n in the upper notch or seat 6 The file isinserted intohandle I*, and clip G set to proper angle to give pitchdesired and clamped fast by screw 19, the file-guide is set at properangle across saw and clamped by screw 2, bolt M is clamped at the properpoint to give desired depth of teeth, and the filing is proceeded with.Usually the first tooth is filed to the proper depth, and the bolt Mthen set, which secures the remaining teeth being filed to the samedepth. After the teeth of one side are filed the saw is reversed end forend, and by means of the graduation on arm a the fileguide can be set togive exactly the same angle to the teeth of both sides-a condition whichis essential to the best results in sawing.

What I claim, and desire to secure by Letters Patent, is-

1. In a saw-filing device the combination of the supporting-frameprovided with clampscrews for attaching it to a rigid support and havingpivoted thereto a frame-adapted to clamp the saw, the supporting-armsliding on the top bar of said supporting-frame and carrying avertically-sliding guide-arm extending lengthwise of the saw, aswiveling fileguide carried by said guide-arm and means for clamping thesame thereto at any angle, a file-carrier sliding in the file-guide andhaving at one end a springclip and at the other a clamping-handle forholding the file and means for setting the same at any pitch, avertically-adjustable stop on the supportingarm for limiting themovement of the guidearm, and an adjustable gage sliding on saidsupporting-arm and means for setting the same at definite points,substantially as described. I

2. In a saw-filing device the combination of the rectangular frameadapted to be attached to a rigid support and having pivoted thereto aframe adapted to clamp and hold the saw, a depending arm sliding on thetop bar of said supporting-frame and carrying a verticallyslidingguide-arm extending lengthwise of the saw, an adjustable stop sliding inthe depending arm for limiting the movement of the guide-arm, aswiveling file-guide carried by said guide-arm and means for clampingthe same thereto at any angle, a file-carrier sliding in the file-guideand having at one end a spring-clip and at the other a clamping-handlefor holding the file and an index for set-' ting the same at any pitch,and an adjustable gage sliding on said supporting arm and having a studseating in notches on said arm, substantially as described.

3. In a saw-filing device the combination of the rectangular frameadapted to be attached by its end bars to a rigid support and havingpivoted thereto a frame adapted to clamp and hold the saw, a slotteddepending arm sliding on the top bar of said supporting-frame andcarrying a vertically-sliding guide -arm extending lengthwise of thesaw, an adjustable clampingstop sliding in the slot of the depending armfor limiting the movement of the guide-arm, a swiveling file-guidecarried by said guide-arm and means for clamping the same thereto at anyangle, a file-carrier sliding in the file guide and having at one end aspring-clip for the file-point and at the other a clamping-handle forholding the file and an index for setting the same at any pitch, and avertically-adjustable gage sliding on said supporting-arm and having astud seating in notches on said arm, substantially as described.

4. In a saw-filing device the combination of the supporting-frame havingits end bars extended and provided with clampingscrews and havingpivoted thereto a clamping-frame whose lower bar corresponds with thelower barof the main frame and is appressed thereto by binding-screwsfor rigidly holding the saw, a slotted depending arm sliding on the topbar of the main frame and carrying an adj ustable sliding gage forsetting the edge of the saw, a lengthwise-extending guide-arm sliding onthe depending arm and having pivoted thereto a file-guide, aclamping-screw for setting the file-guide at any angle to the saw, anadjustable clamping-stop seating in the slot of the depending arm forlimiting the play of the guide-arm, a file carrier compris- In testimonywhereof I hereto affix my signature in presence of two witnesses.

CHARLES G. MITCHELL. W'itnesses:

WM. G. TAYLOR, JOHN R. RYDER.

ing a bar sliding in the file-guide and having

